Brush.



e. c. BEMIS.

BRUSH APPLIQATION FILED ooT.1, 1912.

l Patented June 16,1914.

lmfenlfw, Gilbeoffaemis;

UNITED STATES PATENT OFFICE.

,GILBERT C. BEMIS, O`F WORCESTER, MASSACHUSETTS,l ASSIGNOR OF ONE-HALF TO EDWARD F. FLETCHER, 0F WORCESTER, MASSACHUSETTS.

Specification of Letters Patent.

Patented June 16, 1914.

f Application iled October 1, 1912. Serial No. 723,342.

ments in Brushes, of which the following is a specification.

The object of this invention is the construction of certain improvements in brushes whereby the bristles are readily replaced, adjusted and secured in place; the same being specifically adapted for cylindrical brushes used for cleaning large guns and the like.

Referring to the drawings forming part of this specification, Figure 1 is a cross section of a cylindrical brush provided with the brush-units embodying the essential features of my improvements. Fig. 2 is a plan view of one form of thebrush-unit cylinders. Fig. 3 is a longitudinal section of the same. Fig. 4 is asimilar section showing the cylinder after it has received the crimping which serves to fasten the bristles in the same.

A brush-unit consists of la cylinder or shell l adapted to have the bristles or wires 2 fastened therein by the peripheral compression of the shell at a line intermediate of its ends, at 3 in Fig. l. When the bristles are of woody fiber or animal origin, such compression is sufficient to secure the same strongly in place, but when they are of wire or thinribbon metal, I find it advisable to insert a plug 4 in the heart of the bunch of bristles, in which plug is an annular groove coinciding in general position with the intended peripheral compression of the shell. I

Then when the shell is compressed after the wires and plug have been inserted therein, the wires will be forced moreor less into the groove in the plug and by such lateral distoi-tion will be locked against withdrawal. By 'having the outer end of the plug rounded as shown in Fig. 1, the bristles or wires will bend over such end when forced inward by operative pressure, but will spring back when the pressure is yremoved and Wlll not receive a permanent set or bend, as would be the case were the end of the plug a rightangled edge. The groove 5 in the plug is, it

will be further noted, not a deep one into which the wires might be bent so sharply as to cause their fracture and consequent falling out, but the groove isv shallow and rounded so that the wires cannot be forced therein beyond their safe limit'.l I have found that it is necessary to form the shell 1 with an outwardly extended flange 6, as shown'in Figs. 1 to 4, or else to provide it with a. bottom 7 in order to sustain the shell againstdist-ortion when receiving the peripheral depression 5, since otherwise the shell will be crushed out of its cylindrical shape. In order to employ these brush-units f or cleaning out-large pieces of ordnance, I provide a cylindrical head 10 having numerous radial holes 411 fitting the shells l. In case the shells are formed with the iianges 6, the brush-units are secured adjustably in said holes by means of spring cushions 12 seated on the bottoms of said holes, and screws 13 passing through said flanges and tapped into the head 10, as illustrated in Fig. 1. Vhen said screws are unloosened, said springs force the brush-units outward more or less,`while an inward turning of said screws reduces the operative diameters of the brushes. I have found that by using a longer or shorter plug 4, the spread of thebristles 2 can be varied considerably, the longer plugs spreading'the outer ends of the bristles more than the shorter plugs whose outer extremities stop nearly flush with the shells 1.

What I claim las my invention and for which I desire to secure Letters Patent is as follows, to Wit;-

A brush comprising aV cylindrical shell having an integral radially project-ing eX- tension at one end, bristles in said shell, and a plug located cent-rally Within the bristles, the shell being peripherally compressed at an intermediate point of its length.

In testimony that I claim the foregoing invention, I have hereunto set my hand this 29th day of August, 1912.

GILBERT o. BEMIs.

Witnesses:

A. B. UPHAM, GEORGE F. WALES. 

